JPS6184782A - Limiter - Google Patents

Abstract

PURPOSE:To set an arbitrary limit range and to reduce the delay time by controlling a selector using an output signal of a memory where an operation result of a computing element is inputted. CONSTITUTION:Inputted two binary numbers A and Bare operated in a computing element 1 and outputted. An output signal E of the computing element 1 is inputted to a memory 2 to designates an address of data stored in a certain address. Each data is stored in a certain address in the memory 2, and the data stored in the address designated by the output signal E of the computing element 1 is read and outputted as an output signal F of the memory 2. A selector 3 selects and outputs one of the signals: the signal E of the operation result outputted from the computing element 1, the first control signal C or the second control signal D, according to the logic of an output signal F of the memory 2.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a limiter device used, for example, as a voltage limiter for preventing equipment from being destroyed by overvoltage;
Especially in its digital signal stage +7, ? This invention relates to a device for controlling throat value.

[Prior art]

Generally, when a binary number is operated on by a computing unit, the method to prevent the value output from the computing unit from exceeding a certain range or exceeding a certain range is to The methods used have been to manage the values in advance so that the calculated values do not exceed a certain range, or to process the calculated values using software on the receiving side.

However, in the former of the above-mentioned conventional devices, it is necessary to monitor the input binary numbers so that the output value of the arithmetic unit does not exceed a certain range, and in the latter, the value output from the arithmetic unit must be monitored by software. This poses a problem in that it requires a delay time for software processing, and it takes a long time from when a binary number is given until the calculation result is output.

[Summary of the invention]

This invention was made with the aim of improving such a problem, and the calculation result of the arithmetic unit is inputted after the arithmetic unit as a signal indicating the address of the storage device, and the data stored at this address is output. storage device.

The input signal is input by using a selector that switches and outputs only one of the operation result output from the arithmetic unit, the first control signal, or the second control signal according to the output signal output from the storage device. There is no need to manage binary numbers before operation.

The delay time from giving a binary number to outputting a result is short, and the value of the data stored in the storage device is changed to change the value of the input first control signal and second control signal. The present invention proposes a limiter device that can arbitrarily set the range of outputtable values by changing each value.

[Embodiments of the invention]

FIG. 1 is a block diagram showing an embodiment of the present invention. In FIG. 1, (a) and (b) represent input binary numbers.

(1) is an arithmetic unit that inputs binary numbers (a) and (b) and outputs the operation result, and (2) inputs the output signal (e) of the operation result of arithmetic unit (1) and outputs the input signal. (3) is a storage device that stores data corresponding to the data in advance and outputs the pre-stored data according to an input signal;
2) Depending on the logic state of the output signal (f) output from the arithmetic unit (the output signal (e) of the calculation result output from 11, the first control signal (c), or the second control signal) This is a selector that switches and outputs only one of the following.

In the apparatus configured as described above, the given two types of binary numbers (a) and (b) are operated on by the arithmetic unit (1) and outputted as operation results corresponding to the respective digital quantities. The output signal (e) of this arithmetic unit (11) is input to the storage device (2) and specifies the address of data stored in the storage device (2). Each address of the storage device (2) has a predetermined value. The data stored in the address specified by the output signal (e) of the arithmetic unit (1) is read out, and this data is sent to the output signal (e) of the storage device (2). Output as .

The selector (3) selects the output signal (e) of the calculation result output from the arithmetic unit (1), the first control signal (c), or the first control signal (c) depending on the logic state of the output signal (f) of the storage device (2). Only one of the two control signals) is switched and output.

In the embodiment shown in FIG. 1, the 2 selector (3) selects one of the output signals (e) of the arithmetic unit (1) or the first control signal (or the second control signal) from the storage device (2). When the signal (to) output from the arithmetic unit (11) is "0", the output signal (e) of the calculation result of the arithmetic unit (11) is sent to the signal (to) output from the storage device (2).
When is “1”, the first control signal (c) is sent to the storage device (2).
When the signal (to) output from is "2", the second control signal) is selected and output.

FIG. 2 shows one embodiment shown in FIG. 1 above.

This is an example showing the relationship between the output signal (E) of the arithmetic unit (1) and the signal output from the selector (3) in the case of preventing values outside a certain range from being output, and the example shown in Fig. 2. Now, set the upper limit value that determines the output range of the calculation result to 12''.

The lower limit value is set to °3''.At this time.

The first control signal ←j is set to the lower limit value "3" which determines the output range of the calculation result, and the second control signal () is set to the upper limit value "12" which determines the output range of the calculation result.

If the calculation result of the calculation unit (1) is smaller than the lower limit value that determines the output range of the calculation result, in the example of FIG.
If the output result of is smaller than "3", the 2 selector (3) selects the output signal (E) of the calculation result of the calculation unit (1) or the first control signal (/-1 or the second control signal). Among them, the lower limit value that determines the output range of the calculation result, that is, the first control signal No. 0, is selected and outputted, and when the calculation result of the calculator (1) is greater than or equal to the lower limit value and less than the upper limit value, in the example of FIG. Arithmetic unit (1)
When the output result is "3" or more and 12" or less, the output signal (E) of the calculation result of the calculation unit (1) is selected and output, and the calculation result of the calculation unit (1) is within the output range of the calculation result. If it is larger than the upper limit value to be determined, in the example of FIG. 2, the output result of the arithmetic unit (1) is larger than "12".

The upper limit value that determines the output range of the calculation result, that is, the second control signal) may be selectively output.

The storage device (2) stores the output signal (
E) is input as a signal specifying an address, and the data stored at the specified address is read out and output to the readout 2 selector (3). Arithmetic unit (if the calculation result of 11 is "3" in small letters,
In other words, when the address of the storage device (2) is specified from address 0 to address 2, the 9 selector (3) The first control signal ←→ indicating the lower limit value that determines the output range of the calculation result is selected and output. Arithmetic unit (1)
If the calculation result is ``3'' or more and ``12'' or less, that is, if the address of storage device (2) is specified from address 3 to address 12, data is stored in advance from address 3 to address 12 of storage device (2). 1 selector (
3) selects and outputs the output signal (E) of the calculation result of the calculation unit (1). When the calculation result of the arithmetic unit (1) is larger than "12", that is, when the address of the storage device (2) is specified as an address 13 or higher, data "2" is stored in advance at the address 13 or higher of the storage device (2). By storing this information, the 2 selector (3) selects and outputs the second control signal indicating the upper limit value that determines the output range of the calculation result.

Figure 3 shows the relationship between the addresses of the storage device (2) and the data stored in advance at each address when the output range of the signal (G) output from the selector (3) is as shown in Figure 2. FIG. By making the data stored in advance in the storage device (2) as shown in FIG.

When the calculation result of the calculation unit (1) is smaller than the lower limit value that determines the output range, the 2 selector (3) outputs the first control signal (c) indicating the lower limit value of the output range of the calculation result.

If the calculation result of the calculation unit (1) is greater than or equal to the lower limit value that determines the output range and less than or equal to the upper limit value, the output signal (e) of the calculation result of the calculation unit (1) is output, and the calculation result of the calculation unit (1) is If the upper limit of the output range is larger than the upper limit of the output range, the 1 selector (3) outputs the second control signal indicating the upper limit of the output range of the calculation result, so the calculation result of the calculation unit (1) is Even if the output range of the result is exceeded, the output signal (g) of the selector (3) does not output data outside the range of the upper limit value and lower limit value that determine the calculation result.

FIG. 4 shows one embodiment shown in FIG. 1 above.

This is an example showing the relationship between the output signal (E) of the arithmetic unit (1) and the signal output from the selector (3) when a value within a certain range is output, and in Fig. 4, the output range is determined. The boundary values are set to ``3'' and 12'', so that values in the range greater than 3 and less than 12 are not output.At this time, the first control signal (c) is used to output the calculation result. Set the boundary value "3" to determine the range.

When the calculation result of the calculation unit (1) is "3" or less, that is, when the address of the storage device (2) is specified from address 0 to address 3, the 1 selector (3) selects the calculation result of the calculation unit (1). All you have to do is select and output the output signal (E) of the storage device (2).
By storing “0” in advance from address 0 to address 3 of )
Select and output. If the calculation result of the arithmetic unit (11) is greater than "3" and less than "12", that is, the storage device (
2) When the address is specified from 4th to 11th.

Since the selector (3) only has to select and output the first control signal 1-+ indicating the boundary value that determines the output range of the calculation result, "
1'', the 1 selector (3) selects the first control signal (C) according to the output signal (H) of the storage device (2).
Select and output. Arithmetic unit (the calculation result of 11 is ``12''
12'', that is, when the address of the storage device (2) is specified as 12 or more, the 1 selector (3) only needs to select and output the output signal (e) of the calculation result of the arithmetic unit (1). , “
0'', the 1 selector (jl) selects and outputs the output signal (e) of the operation result of the arithmetic unit (1) according to the output signal (e) of the storage device (2).

Figure 5 shows the relationship between the addresses of the storage device (2) and the data stored in advance at each address when the output range of the signal (G) output from the selector (3) is as shown in Figure 4. FIG. (by storing data in advance in the storage device (2) as shown in FIG. 5).

Even if the calculation result of the calculator fl) outputs data within the set range, the 2 selector (3) does not output data within the set range.

In addition, the range of outputtable values can be set arbitrarily by changing the data value stored in advance in the storage device (2) and the value of the first control signal ← j and second control signal). can.

〔Effect of the invention〕

As explained above, the present invention controls the selector by the output signal of the storage device into which the calculation result of the calculation unit is input, and the selection unit is controlled by the output signal of the storage device into which the calculation result of the calculation unit is input, or the calculation result output from the calculation unit, the first control signal, or the second control signal.
By switching and outputting one of the three types of control signals, the limit range can be set arbitrarily, and the delay time from giving input to the arithmetic unit to outputting the output signal is short. This has the effect of realizing a limiter device that prevents values outside the range or within a certain range from being output.

[Brief explanation of the drawing]

(Fig. 1 is a block diagram showing one embodiment of the present invention, and Fig. 2 is based on the embodiment shown in Fig. 1.) Output of an arithmetic unit when preventing values outside a certain range from being output. FIG. 3 is a diagram showing an example of the relationship between signals and the output signals of the selector. When the output range of the output signal of the selector is in the example shown in FIG. FIG. 4 is a diagram showing the relationship with data to be stored. FIG. FIG. 5 is a diagram showing an example of the relationship between output signals, and FIG.
FIG. 3 is a diagram showing the relationship between addresses of a storage device that controls the time selector in the example shown in the figure and data stored in advance at each address. In the figure, (a) and (b) are input binary numbers, el is the first control signal, ni) is the second control signal, (g) is the output signal output from this device, and (1) is an arithmetic unit, (2) is a storage device, and (3) is a selector. In FIG. 9, the same or corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] In a device that prevents a value outside a certain range or within a certain range from being output as a result of calculating a given binary number, an arithmetic unit that calculates the input binary number and outputs the result; a storage device which inputs the output signal of the arithmetic unit and outputs stored data according to the input signal; and outputs only one of the output signal of the arithmetic unit, a first control signal, and a second control signal from the storage device. A limiter device comprising a selector that selects and outputs a selected signal based on a switching signal.